#pragma once

#include <iostream>
#include <string>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <cstdlib>

#include "Common.hpp"
#include "Log.hpp"
#include "InetAddr.hpp"

namespace SocketModule
{
    using namespace LogModule;
    const static int gbacklog = 16;

    //模板方式模式
    //基类socket,大部分方法，都是纯虚方法
    class Socket
    {
    public:
        virtual ~Socket(){}
        virtual void SocketOrDie() = 0;
        virtual void BindOrDie(uint16_t port) = 0;
        virtual void ListenOrDie(int backlog) = 0;
        virtual std::shared_ptr<Socket> Accept(InetAddr* client) = 0;
        virtual void Close() = 0;

        virtual int Recv(std::string* out) = 0;
        virtual int Send(const std::string& message) = 0;
        virtual int Connect(const std::string& server_ip, uint16_t port) = 0;

    public:
        void BuildTcpSocketMethod(uint16_t port, int backlog = gbacklog)
        {
            SocketOrDie();
            BindOrDie(port);
            ListenOrDie(backlog);
        }

        void BuildTcpClientSocketMethod()
        {
            SocketOrDie();
        }

        // void BuildUdpSocketMethod()
        // {
        //     SocketOrDie();
        //     BindOrDie();
        // }
    };

    const static int defaultid = -1;

    class TcpSocket : public Socket
    {
    public:
        TcpSocket() : _sockfd(defaultid)
        {}

        TcpSocket(int fd) : _sockfd(fd)
        {}

        ~TcpSocket(){}

        void SocketOrDie() override
        {
            _sockfd = ::socket(AF_INET, SOCK_STREAM, 0);
            if(_sockfd < 0)
            {
                LOG(LogLevel::FATAL) << "socket error";
                exit(SOCKET_ERR);
            }
            LOG(LogLevel::INFO) << "socket success";
        }

        void BindOrDie(uint16_t port) override
        {
            InetAddr localaddr(port);
            int n = ::bind(_sockfd, localaddr.NetAddrPtr(), localaddr.NetAddrLen());
            if(n < 0)
            {
                LOG(LogLevel::FATAL) << "bind error";
                exit(BIND_ERR);
            }
            LOG(LogLevel::INFO) << "bind success";
        }

        void ListenOrDie(int backlog) override
        {
            int n = ::listen(_sockfd, backlog);
            if(n < 0)
            {
                LOG(LogLevel::FATAL) << "listen error";
                exit(LISTEN_ERR);
            }
            LOG(LogLevel::INFO) << "listen success";
        }

        std::shared_ptr<Socket> Accept(InetAddr* client) override
        {
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            int fd = ::accept(_sockfd, CONV(peer), &len);
            if(fd < 0)
            {
                LOG(LogLevel::WARNING) << "accept warning...";
                return nullptr;
            }
            client->SetAddr(peer);
            return std::make_shared<TcpSocket>(fd);
        }

        void Close() override
        {
            if(_sockfd >= 0)
            {
                ::close(_sockfd);
            }
        }

        //n == read返回值
        int Recv(std::string* out) override
        {
            //流式读取，不关心读到的是什么
            char buffer[1024];
            ssize_t n = ::recv(_sockfd, buffer, sizeof(buffer) - 1, 0);
            if(n > 0)
            {
                buffer[n] = 0;
                *out += buffer;
            }
            return n;
        }

        int Send(const std::string& message) override
        {
            return send(_sockfd, message.c_str(), message.size(), 0);
        }

        int Connect(const std::string& server_ip, uint16_t port) override
        {
            InetAddr server(server_ip, port);
            return ::connect(_sockfd, server.NetAddrPtr(), server.NetAddrLen());
        }


    private:
        int _sockfd;//listensockfd, sockfd
    };

    // class UdpSocket : public Socket
    // {

    // };

}
